Spark-arrester



(No Model.)

E. W. SMITH 8v C. SAX.

SPARK ARRESTBR.

Patented Aug. 9, 1892.

we noms wens co., maro-uws.. msmm'wu, n. r.

UNITED STATES yPATENT OFFICE.

llDGAR W. SMITH AND CONSTANTINE SAX, OF MORRIS, MINNESOTA.

SPARK-ARRESTER.

SPECIFICATION forming part of Letters Patent No. 480,390, dated August 9, 1892.

Application filed February 3, 1892.

To a/ZZ whom, t muy concern:

Be it known that We, EDGAR W. SMITH and CoNs'rAN'rINn SAX, citizens of the United States, residing at Morris, in the county of Stevens and State of Minnesota, have invented a new and useful Spark-Arrester, of which the following is a specification.

VThe invention relates to improvements in spark-arresters.

The object of the present invention is to simplify and improve the construction of spark-arresters and to provide one which will obstruct and retain sparks sufficiently to extinguish the saine, but which will not materially obstruct a straight draft. Heretofore inverted cones have been arranged within a smoke-stack which deiiect the current of exhaust against the walls of the smoke-stack, and it has been found necessary to reduce the end of the exhaust-pipe to cause the steam to issue with greater force and velocity to overcome the impeded draft caused by a solid cone, and in so doing there will be more or less back-pressure in the cylinder, which will greatly diminish the strength of the engine. It has also been found that the sparks, after being deflected against lthe walls of the smokestack by the inverted cone, will follow the current upward and pass out the top of the smoke-stack without it being extinguished, especially with straw-burning engines.

It is also the object of this invention to remedy the above objections, and while the spark-arrester is applicable to all character of engines it is more particularly designed for that class of engines which use straw as fuel.

The invention consists in the construction and novel combination and arrangement .of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claim hereto appended.

In the drawings, Figure l is a perspective view of a spark-arrester constructed in accordance with this invention. Fig. 2 is a central vertical sectional view.

Like numerals of reference indicate corresponding parts in all the figures of the drawings.

ZI designates an outer foraminous casing having the shape of the enlarged upper or Serial No. 420.208. (No model.)

funnel-shape portion of a smoke-stack and designed to constitute that portion of a smokestack and adapted to be attached by a clamp 2 to the cylindrical smoke-stack of an ordinary straw-burning engine. The outer casing, which may form a portion of a smokestack or which may be constructed separately and be attached to one,is constructed of wiregauze 3, which is supported by a frame composed of bands 4 and 5 and ribs 6 and 7, the upper ones 6 connecting the bands and the lower ones 7 extending from the band 5 to the clamp 2.

Arranged within the casing and concentric with the lower portion of the same is an inverted foraminous cone 8, constructed of wiregauze, which is secured to a conical frame composed of a band 9 and ribs 10, having their lower ends secured together and their upper ends attached to the band 9.

The sparks and exhaust in ascending the smoke-stack will impinge against the inverted foraminous cone, which will retain the sparks, but which will permit the greater portion of the exhaust to pass through it, thereby providing a straight draft. After impinging against the inverted cone the sparks, together with a small portion of the exhaust, will ascend until they strike the casing through which the exhaust passes, thereby holding the sparks against the casing a sufficient time to extinguish them, after which the sparks will gradually drift upward and pass out of the smoke-stack.

The base of the cone is larger than the opening at the top of the casing, so that the sparks in striking the cone will be directed against the casing. The ribs l0 are extended horizontally at their upper ends, and these extensions 1l are secured to the band 5 of the casing, whereby the cone is suspended in proper position.

It will thus be seen that a substantiallystraight and unobstructed draft is provided and that the sparks are retained a sufficient length of time to extinguish them, after which they pass out of the smoke-stack.

What We claim is- A spark-arrester comprising an outer foraminous casing forming the upper portion IOO of a smoke-stack and consisting of a lower our own we have hereto affixed oursiguatures conical portion and an upper conical portion in the presence ot' tWo witnesses.

having a truncated top forming an opening, EDGAR W. SMITH.

and an inverted foraxninous cone supported CONSTANTINE SAX. 5 within the casing and arranged concentric Witnesses as to Edgar NV. Smith:

with the lower portion of the same and hav- R. REES,

ing its upper end or base of greater diameter D. HORN.

than the opening of the top of the casing, sub- Witnesses as to Constantine Sax:

stantially as and for the purpose described. GEO. E. DARLING,

io In testimony that we claim the foregoing as C. SAX. 

